David gazed admiringly at Fiona's shapely bottom as she monitored the screen, waiting patiently for his two young colleagues to be at the furthest reach from the main entrance in their search for the phantom trespassers, before picking up the radio and summoning them back to relieve their supervisor at the desk.

Naked but for her white socks, loosened school tie and completely unbuttoned blouse, the sexy young academic's appearance thoroughly belied her austere radio manner.

“Post haste, gentlemen, please!” she barked in conclusion, whilst absently caressing her breast beneath her gaping blouse.

Returning the handset to its cradle, Fiona took another glance at the CCTV and judged it should be a good ten minutes before the two young security guards arrived back in the lobby.

“I suppose I'd better make myself scarce,” she said, smiling as she glanced down at her state of dishabille. “No sense in giving those boys any silly ideas.”

Fiona walked to the window and looked out at the near-empty faculty car park, where two modern hatchbacks sat baking under the summer sun.

“Which one's yours?” she asked. “Strange, I wouldn't have had you down as a boy-racer type.”

“I'm not,” said David, handing her a set of keys he had fished from his trousers. “Mine's at the end of the building, in the shade.”

Fiona studied the worn leather fob in her palm. Did that read Aston Martin?

Reading her expression, David volunteered that he didn't actually need the job he was in the process of losing. “But it got me out of the house after I lost Susan,” he said. “And for that I'll be eternally grateful.”

“I couldn't imagine you in anything less,” Fiona asserted, indicating the keys. “Now, do you have a towel or something for me to sit on? I'm afraid I may be a little, erm, leaky.”

David laughed. “Oh don't worry about the leather, my dear,” he said. “Thanks to my wife, those seats have seen plenty of action over the years. You would simply be adding to the patina.”

His eyes then dropped to the flickering bank of screens. “Now you'd better go,” he added. “They'll be back soon, and I need to get this place ship-shape before I come out and join you.”

Watching Fiona bend down to pick up her discarded skirt, David was treated to a perfect view of her shapely bottom, and the teasing shadow of her pussy beneath.

“Ah, if I ever get tired of seeing that,” he quipped. “Just take me round the back and shoot me!”

Fiona smiled at the compliment. What am I doing? she admonished herself. Men don't have this effect on me!

Yet every woman likes to be admired and Fiona was no exception. The young lesbian found herself responding to David and wanted to please him. Rather than put her skirt back on as might have been more prudent, Fiona simply let it dangle from her fingers and, after retrieving her shoulder bag, headed for the door.

“Ahem... have we forgotten something?” asked David, smiling impishly as he proffered Fiona's dildo.

Fiona chuckled coyly as he slid it into her bag and thanked him with an unexpected kiss.

“I'll be waiting for you,” she added meaningfully. “So don't be too long.”

After checking through a window that the car park was still deserted, Fiona then stepped out into the sunshine wearing nothing more than her unbuttoned blouse and school tie.

Standing on the top step Fiona shaded her eyes from to the harsh glare. She felt the heat of the afternoon sun hit her bare breasts and pubis like a lover's caress, tempting her to strip off completely and bathe in its balmy rays. But good sense prevailed: she had little time to waste and could not risk being caught. As a compromise she flung her tie over her shoulder and slid her blouse completely apart, fully exposing herself as she continued towards the end of the building.

A short time later, Fiona rounded the corner into the shade and saw David's car for the first time. It was just as she had imagined, as though James Bond's iconic DB5 had escaped from the screen and was now right before her in real life. Instantly drawn to the vehicle's elegant lines, she ran her fingers over its warm, silver-grey curves.

Looking through the windscreen, Fiona couldn't help smiling when she noticed the mottled markings on the leather interior, mainly on what she assumed to have been David's wife Susan's passenger seat. To any casual bystander these might simply have been from the innocent spillages of passengers' drinks or snacks over the years. But after David's explanation earlier, Fiona could imagine the carnal romps which must have taken place to put them there.

Despite being in the shade and wearing next to nothing, the summer afternoon heat was about as much as the pretty young woman could comfortably bear. After fishing a bottle of water out from her shoulder bag, Fiona drained more than half of it before allowing a goodly measure to spill from her mouth and cascade refreshingly down the front of her body.

As she felt it chase over her breasts, washing through her groin and down both legs, its cooling effect on her intimate parts revealed just how exposed she might be to any onlooker. The thought was intoxicating: this was a step up again from her penchant for walking through the halls of academe wearing no underwear. As Fiona opened the car door and tossed her bag onto the rear seat, a billow of escaping warm air washed through her legs like a ghostly erotic caress. She chased it with her fingers before gingerly lowering herself into the charmingly stained passenger seat.

As David had predicted, being in the shade had rendered the leather tolerably warm rather than searingly hot. Nevertheless, Fiona entered the car tentatively, stepping one foot in, then cautiously lowering her tender bottom onto the soft, Jackson Pollock-esque leather. As she touched down, it felt as though the seat itself was coming up to kiss her private parts. Basking in this lascivious caress, Fiona closed her eyes and instantly yielded to her baser, libidinous instincts.

With one foot still outside the car, she slid a hand over her pubis, cupping her moist pussy as she considered the events which had unfolded over the previous hour or two: Fiona had fantasised about a man, stripped as good as naked and been brought to orgasm by a man; and now she was toying with the notion that she might even allow herself to be made love to by one. Not any man, of course, just this particular one. Her fantasy come true.

Curiously enough, Fiona felt neither guilt nor shame in betraying her lesbian sisterhood. Was she perhaps turning straight, she wondered? Her mind conjured up images of desirable women; one in particular, a student she had first seen in the swimming pool and on a few occasions since. Forbidden fruit as far as the faculty were concerned, but exquisitely desirable nonetheless. She had exited the water right in front of Fiona: her microns-thin bikini contouring her nipples and cupping her mound like an invisible hand. Their eyes met and an unmistakable moment passed between them.

Then, in her mind's eye, everyone else in the pool faded away. The alluring young student prowled towards Fiona with feline grace, accompanied now by David, naked and erect. Sliding his hand up her spine he unclasped her bikini top, which clung damply to her skin before falling away, laying bare her pert and tender young breasts.

Turning to thank him, the girl smoothed her fingers over his penis, skilfully masturbating him as he untied and stripped away her wet bikini bottom. As her smooth-shaven young quim was revealed, Fiona felt her heart skip a beat, her own genitals swelling and moistening at the beguiling sight.

Watching these two objects of maximal desire advancing towards her, a surge of lust rippled through Fiona. A revelation then struck her: David's mature masculinity, the mysterious beauty's feminine charms... there was no conflict; she simply craved them both equally. If that marked her as a bisexual, she cared not a jot, right now she was too far immersed in her fantasy to be manacled by mere labels.

Drifting back into her fantasy, Fiona parted her legs at the advancing pair. The naked young swimmer smiled at the sight and stepped forward, leading David by his erection. Without further invitation, she reached into Fiona's crotch, fingered her open, then slid two digits straight inside.

Fiona mewled in delighted surprise and lifted her hips in response before grinding herself around the young student's hand.

“No need to be so gentle,” she soughed, squirming in her seat. “Do me as hard as you like, I promise I won't break.”

Encouraged by her words, the naked girl did just that. Masturbating her determinedly, pleasing Fiona greatly with the distinct, liquid cadence of her fingering.

Then, in an instant, the arresting young beauty switched from being between Fiona's legs to standing right beside her, fondling Fiona's breasts, feeding her own succulent little tits into the lascivious statistician's mouth. She devoured them voraciously, suckling hard on the adorable strumpet's vibrant, rubbery nipples.

Oddly enough, Fiona still felt herself being lewdly manipulated between her legs. Looking downwards, she saw David now kneeling there, wiping his erect penis through her heated, oozing slit, which sent a shiver of anticipation tingling through her pussy.

He raised his eyes to Fiona's and smiled. Then, slowly and deliberately, drifted his gaze downwards over her breasts and belly until he was looking directly between her legs. Then David eased his body forward, positioning himself at the entrance to her cunt and Fiona felt his cock tip first pushing, then plunging inside. Opening her up or the first time. Filling her completely. Violating her so magnificently.

The fantasy was too much for Fiona. Already aroused from all that had happened since she had left her office, plus her daring near-naked walk across the car park, she was all too ready for the orgasm she felt welling up from her core.

“Fuck!” she burst out breathlessly as she squeezed her breast and chopped her fingers into her cunt as she emulated David's erect penis ploughing into her. In previous fantasies where he had featured, he had been rough and domineering, but now, for some reason, she could only see him as being gentle and caring. Which was different, but also very nice.

“Fuck me, David,” Fiona mused aloud in her reverie as she masturbated towards her climax. “Fuck me, cum inside me, you darling, beautiful man...

"Oh!

"Fuck!

"Nnnnnnn!”

In that moment, Fiona's orgasm ripped through her, as strongly as any she'd ever experienced.

Then, as the urgency of climax abated and she drifted into her afterglow, Fiona became aware of a presence nearby. She snapped from her torpor in a panic, frightened she might have been compromised; only to find David standing beside the car, looking charmingly amused.

“I see you started without me,” he said, with a kindly twinkle in his eye.

Minutes later, they were barrelling through the back streets of Edinburgh. Not so fast that they might attract undue attention, but fast enough to deter any casual observers from peering in through the lightly-tinted windows.

Back in the car park, David had succeeded in persuading Fiona not to rearrange her clothes for the car journey, but leave herself fully exposed, promising that he would take a route home that could be virtually guaranteed not to be busy.

On a normal day, Fiona would have balked at the suggestion. But today was no normal day. An impish glint played in her eye as she agreed, but with one condition.

“Only if you're naked too.”

With even a moment's consideration, David shrugged and started undressing in front of her. First his uniform shirt and tie, then his shoes, socks and trousers, until all that remained were his cotton boxer shorts.

To her own uncomfortable surprise, Fiona found herself becoming aroused by this strange experience. Never having watched a man disrobe before, she felt a warm stirring in her loins as each smooth-skinned limb was revealed.

“You shouldn't be doing this,” Fiona said as David casually slid his boxers off and his familiar, now charmingly flaccid, penis was revealed.

“What,” he said, smiling cheerily. “Being as naked as you are?”

Fiona felt her cheeks flush as she coyly chewed her bottom lip. “No,” she said. “I meant turn me on.”

If she had expected David to make light of her confession, Fiona was to be pleasantly disappointed. His smile softened and his eyes wandered down to where her hand had unconsciously slipped between her legs and was discreetly stroking there.

David silently watched Fiona fingering herself, and she noticed his member start to stir into life before her very eyes. It was fascinating to watch, but before it could fully lengthen into erection, David gathered up his clothes, slid his feet back into his stylish deck shoes and motioned Fiona to bring her other leg into the car and close her door. A few seconds later he was settled in the driving seat, preparing to set off.

“One thing before we go,” David said. “As I'm wearing my shoes, you may keep your tie on. But lose your blouse, or I'm putting everything back on.”

Without realising it, David had just triggered something preternatural within his beautiful passenger's soul. Something she tried to keep hidden, but that David's quietly demanding tone had stirred, causing her heart to quicken, her nipples to harden, brighten her eyes and bring a rush of pink to her cheeks.

David found the subtle transformation not only charming, but interestingly familiar.

“Do you mind if I asked...” he asked cautiously. “Are you by any chance familiar with the term D/s?”

The question was hopefully obscure enough for anyone outside the BDSM community to miss. But Fiona did indeed understand the dom/sub reference and felt her heart skip a beat. She ran her tongue across her upper lip and lowered her eyes demurely into her lap.

“Yes, sir.”

David considered this unexpected new information.

“Tell me, my dear,” he gently enquired. “Do you currently have a dom or a domina?”

Fiona meekly shook her head. “No, sir.”

A measured pause.

“Would you like me to be yours for the day? I can be as gentle or as firm as you prefer, you set the limits.”

It was an offer too enticing to refuse. If Fiona was to dip her toes into world of bisexuality, she might as well go in up to the ankles.

“If that would please you, sir,” she said, raising her eyes to his. “I should like to try.”

Fiona's gaze then dropped again, though this time directly to his penis, which was now fully erect and standing up from his groin. It was her first real opportunity to examine one, but before she could get a proper look at it David reached across and lightly closed his hand over one of Fiona's modest breasts, capturing its erect nipple in the crook of his fingers.

“You can explain your preferences and limits on the journey,” he said. ”But when I am in session,” he added, crushing Fiona's nipple and bringing a tear of delight to her eye, “Unless I say otherwise, I am the only one who wears clothes.”

With that, he released and caressed Fiona's breast, then leaned across, lovingly kissing her now acorn-hard nipple and eliciting a sigh of satisfaction to escape from her throat. It was the first time any man other than her father had even kissed her, and to be on such an intimate part of her body was, quite literally, a fantasy come true.

With the fresh, slightly salty, taste of Fiona's breast lingering in his mouth, David sat back in the driving seat and fired up the Aston's engine.

At his side, and quietly basking in the unexpected development, Fiona had already slipped into her role as a submissive. Although David had not formally declared them to be “in session,” she wanted to demonstrate she was serious; so, as well as removing her blouse as ordered, Fiona voluntarily slipped off her shoes and removed her long white socks. All she was now wearing was her old school tie.

David smiled approvingly and informed her she could leave it on if she wished.

“Thank you for the offer, sir,” Fiona replied, but nevertheless tugged the tie loose and cast it over her shoulder onto the back seat. Fiona was now as naked as the day she was born. And was about to be so whilst being driven through the city.

David nosed the car out through the gates of the university, and Fiona's heart leapt into her mouth. Everyone in the street seemed to turn and look at her in the car, completely nude and exposed. She had never felt more naked in her life.

But her concern swiftly ameliorated when she realised the pedestrians were not really looking at her, but at the vintage Aston Martin she was sitting in. The tinted glass was doing its job in protecting her, and Fiona began to relax. She even started enjoying the smiles and nods of appreciation they were attracting. So much so, Fiona's fingers found themselves stealing slowly towards her lap.

David noticed what she was doing. “No need to be coy,” he said encouragingly. “If you're feeling horny, just go ahead and masturbate. After all, it's a bit late to start feeling shy now.”

Fiona blushed at being caught, but accepted his offer with a muted “Thank you, sir.”

She slid her thighs open, smoothed her fingers over her pubis and down through her sticky-warm pussy. Almost instantly she began masturbating: rubbing her clitoris with one hand whilst fingering herself with the other. It felt so good. And so naughty, doing it openly in front of a relative stranger.

Whether it was David's proximity, her acute awareness of there being nothing but a pane of glass between her the outside world, or the abundance of hormones that had been coursing through her system that day, but Fiona already felt the embers of another orgasm being fanned into flame deep within her core.

True to David's word, they were soon in a much quieter part of the city, with far fewer people on the streets. The houses were bigger, the gardens more spacious – judging by the amount of greenery, they would soon be in the countryside. As exciting as it was to be naked in the middle of town, Fiona now found herself able to relax, to enjoy her masturbation. Even, perhaps, to put on a special show for her equally naked driver.

But then, as they were driving up a quiet leafy lane on the outskirts of the city, David was forced to brake hard when a young dog shot out through a garden gate and onto the road directly in front of the car. Fiona was jolted forward, but fortunately restrained by her safety belt.

Seconds later, a young redhead appeared, in panic and disarray, presumably directly from sunbathing in the garden, as she was barefoot and wore just a skimpy, half-fastened bikini clutched to her breasts with a forearm. Pausing only to assure herself it was safe to do so, she stepped into the road and used her free hand to grab the dog by its collar.

Looking extremely relieved at being able to retrieve her pet safely, the young sunbather smiled warmly at David and mouthed a heartfelt “Thank you” to both the car's occupants. It was only then that she noticed, through the sun's glare and the bluish tint on the windscreen, that both he and his passenger were apparently naked to the waist.

Fiona's heart sank at the thought that they had been discovered like this, and she brought her hands up to cover her breasts. The girl, meanwhile, after sending the dog back into the garden with a sharp reprimand, simply stood in the middle of the road, directly in front of the car. After quickly reassuring herself they were alone on the street, she gave a charmingly impish smile and casually lowered both arms.

What bikini top the girl had been wearing merely comprised two tiny triangles of fabric and some string, designed more for sunbathing than for protecting its wearer's modesty. With her arms at her sides, these scraps of material slid free, releasing her firm young breasts, much to both David's and Fiona's appreciation.

“God, she's lovely,” Fiona sighed. Then, without thinking, ran her tongue tip meaningfully across her lips.

The half-naked stranger looked quizzically at Fiona. “You like girls too?” she mouthed.

Fiona coyly nodded. The girl smiled and, whilst maintaining eye contact with her, walked purposefully towards the Aston's passenger door.

Fiona watched her all the way, admiring her toned, young body and the fiery locks tumbling over her shoulders. She wound the window down as the young beauty came alongside, forgetting how much its tinted glass had been concealing.

“Wow, you're both properly naked!” said the girl. “I thought you just had your tops off. But that is so... wow!”

“You're pretty wow yourself,” Fiona said, openly admiring her tanned, supple breasts. “If you don't mind me saying so.”

The girl bent down and playfully presented her face and chest through Fiona's open window. “Thank you,” she said. “And no, I don't mind at all. This is the most fun I've had since I came home a week ago, to look after the place while my parents are on holiday. Everyone around here are boring old duffers like they are. I swear, I've seen more life in a funeral parlour!”

Fiona's eyes were riveted to her lovely young breasts, which jiggled sumptuously as she spoke.

“So you're not a lesbian after all, then?” said the girl somewhat poignantly.

“What makes you think that?”

“Well your boyfriend sitting next to you has a lovely big erection,” she chuckled. “Which I'm sure didn't arrive just because I turned up. If you don't mind me saying so, it smells like sex in here. Plus, I've been waving my tits in front of you for... oh!”

Whether it was the indignity of having her sexuality challenged, or the tantalising proximity of the girl's naked and very lovely breasts, but Fiona could restrain herself no longer. Closing her mouth over the girl's nearest teat, she ravenously latched onto its plump little nipple and fed on it like a hungry babe in arms.

The girl gasped and moaned, but made no move to pull away. Instead, she brought her hand up to her other breast and fondled herself momentarily, before reaching into the car in a blind grope for Fiona's body.

She was met instead with having her breast released, as Fiona breathlessly asked, “Are you looking for my tits or my pussy?”

There was a pause as the girl lowered herself slightly, then brought her head and most of her upper torso in through the open side window. Her face was flushed and beaming.

“Both,” she said, her eyes sparkling with mischief. “But I want your mouth first.”

With that, she promptly engulfed Fiona in a kiss, while her fingers roamed freely over her breasts and body. After squeezing her nipples, the young girl smoothed her caresses purposefully downwards, until she encountered another hand.

Fiona had been busy masturbating of course, but immediately took her hand away, spread her thighs even further apart and guided the girl's hand to her cunt.

“Mmmm, you're really wet down there, aren't you?” soughed the girl, her actions vaulting Fiona into a torrid frenzy of sapphic desire.

“You make me even wetter,” she gasped, her submissive nature already unleashed. “I'm just putty in your hands, a filthy little slut.”

There was a moment's pause, then she added, with halting urgency, “I'm so close.... a wanton whore... would you bring me off, so I can start on you... please?”

As she said it, the girl skilfully sent her fingers stroking down through her slippery slit, then hooked them straight upwards and thrust them high into Fiona's tight but sodden cunt.

“Oh, fuuuu.....!”

The girl chuckled gleefully into Fiona's mouth as her willing victim writhed and bucked under her dexterous ministrations. She loved making other women cum, and this was an opportunity too good to pass up. She fucked her fingers into Fiona's virgin hole, simultaneously exposing and crushing her raw clitoris with the heel of her hand with every instroke. Building her orgasm like a masterful symphony, until...

“Cum for me, my lovely little fucktoy! Cum hard, and cum now!”

The girl timed her masturbation perfectly. Forcing her tongue as deeply into Fiona's mouth as it would go, then writhing her fingers over her G-spot, tugging and rubbing as she lifted Fiona's pelvis with her ministrations.

Fiona felt the orgasm welling up inside her like an irrepressible force of nature. She didn't know what had hit her, it had been so long since any lover had known her body like this girl obviously did – and when it broached, she surrendered completely to it, melting into its core like an ice cube before a roaring furnace.

“Thank you, that was lovely,” Fiona said, once her consciousness had resurfaced. Without realising it, she must have drifted away for a few seconds, because the girl had leaned even further into the car and was contentedly fondling David's erection.

“Mmmm... so is this,” she mused, acknowledging Fiona's remark. “I hope you don't mind, but my hand was wet from your juices and I needed something to wipe it on.”

Fiona smiled, then kissed the girl on the mouth. “I don't mind at all,” she said. “And something tells me David doesn't mind, either.”

They all chuckled at this.

“David, eh? So your name's not James Bond?” quipped the girl. “A shame. But it's nice to meet you, David, I'm Jenny. It's always good to know the name of the guy or girl I'm masturbating.”

Fiona laughed, then introduced herself too before commenting, “It's really quiet around here, isn't it? I can't believe you've been standing there as good as naked all this time, and not a soul has gone past.”

Jenny shrugged, sending a shiver of movement across her pendant breasts. “Unless they're visiting the big houses at the end of the road, it's pretty much a ghost town around here during the day,” she explained. “You're welcome to come in and help me kill the rest of the day if you like, or do you two have other plans?”

A little self-conscious of being put on the spot, Fiona had to confess that, while she was content with her life as a lesbian, she was hoping David would help address her curiosity regarding bisexuality.

“Ah, you want some alone time to fuck him,” said Jenny. “I completely understand, so I won't detain you. Personally, I went the other way, starting with boys before I tried my first taste of honey. I love them both equally now. Let me know how you get on, ok? Either or both of you, I'm open to any and all combinations.”

With that, Jenny backed out of the passenger window the way she had come, but not before she had given David's erection a farewell caress and tenderly kissed both of Fiona's nipples on her way out.

Then, as she was lifting herself away, her bikini top caught in the handle of the window winder. Rather than unhook it, Jenny simply dipped her neck and let it slide back into the car before standing up, resplendently topless.

“Give it back to me when you call in next time. Remember, you owe me an orgasm!” she laughed, before nimbly stripping off her miniscule bottoms and tossing them in through the window, adding, “Here, you might as well have these as well!”

A short while later, after watching Jenny's shapely body disappear through her garden gate, David engaged first gear, and they resumed their journey along the leafy lane.

“Well, that was unexpectedly entertaining,” said Fiona. “So, may I ask... did you like how she touched you back there? You know, the way she was stroking you.”

David smiled, then answered with a question of his own. “Did you like the way she was stroking you?”

Fiona didn't respond. Instead, she placed her hand on David's thigh. Then, slowly and tentatively, slid it ever higher, until she finally closed her fingers around his erection and began stroking him timidly, as she might a cat.

“That's very nice, thank you,” said David, conscious of his partner's inexperience. “You don't need to be so gentle, though: just the tip and my balls are sensitive, but the rest rarely complains, so long as it gets attention.”

Fiona chuckled. “Like a pussy,” she said. “Depending on my mood, I like having just about anything done to mine.”

“So I noticed,” David said cheerily. “You're quite the wee sex kitten, aren't you?”

Before Fiona could respond, David then turned the car off the lane, through an ornate gateway and up a lengthy, curving drive towards a substantial Victorian manse.

“You live here?” Fiona asked, somewhat incredulously.

David nodded. “It's too big for me now I'm on my own,” he explained. “But my daughter loves it, because it reminds her of her mother. She doesn't come home often enough to enjoy it much, but she won't let me sell it.”

They pulled up in the shade of a small portico outside the front door. From her expression, David could tell that Fiona had a myriad questions whirring through her mind, so he volunteered some more information. “After Susan died and my daughter Cassie went back to uni, I didn't need money, but I did need a distraction. The job with the university came up at just the perfect time, so I applied and here we are.”

Fiona nodded, her eyes flitting around, as if searching for something. Or someone.

“If you're wondering if we'll be disturbed,” David added, “I have a girl who comes in most days, to help about the house, but she's on holiday right now. I do the gardening myself, so if you press the remote control you'll find in the glove box, the gate will close and I think you'll find we're completely alone here.”

Sliding her hand away from David's penis, Fiona did as he had suggested, then turned to watch the gates close, but found herself looking at a driveway which simply disappeared behind a short avenue of hedges. Casting her eyes around, they seemed surrounded by lawns, flower beds and greenery, with no other buildings in sight. If it wasn't for the distant hum of traffic, they might easily have been in the Cairngorms.

“Impressive,” Fiona remarked. Then, opening the car door, she stepped out and felt the warm air again, billowing against her naked body. “This is heavenly,” she added. “If I might only trouble you for a quick shower to wash this stink away, it'd be truly perfect.”

“Ah, the sweet odour of an aroused woman,” David said, smiling. “If I could bottle it, I'd make a fortune. But, my dear girl, of course you may have a shower, if that's what you want. Or, if you'd care to follow me for a moment..”

Fiona's curiosity was piqued. With David leading the way, the naked pair walked out into the afternoon sunshine and around the side of the building, where she was pleasantly surprised to find a well-appointed recreational area, complete with a modest-sized pool and a raised deck containing tables, seats, lounges, an outdoor cooking area and a large covered hot tub.

Seeing that Fiona appeared drawn to the hot tub, David drew back its cover and, whilst explaining that both it and the pool were permanently heated by an array of hidden solar panels, threw a small switch on a control panel. The tub instantly came to life as the underwater jets fired up, turning the surface into a seething cauldron of bubbling eruptions.

“So you have a choice of a shower, the hot tub or the pool,” said David. “Or, if you like, I could easily get the garden hose out.”

It was then he noticed Fiona standing awkwardly, rubbing her knees nervously together.

“Ah, all the water?” he said knowingly. “Trust me, you're not the first. But no problem, I can either show you to a bathroom inside the house or, if you're desperate...” David indicated the expanse of sweeping lawns and gardens surrounding them.

Fiona's face melted into a grateful, albeit urgent, smile. “Are you sure you don't mind?” she said, by now shuffling agitatedly from foot to foot.

“Not at all, please be my guest,” said David cheerfully. “I love watching a pretty girl pee, it's one of my favourite little peccadilloes.”

Convinced he was pulling her leg, Fiona smiled. “You're a strange, perverted old man,” she chuckled, shaking her head. “I knew there was a reason I liked you.”

With that, Fiona walked gingerly out across the grass, trying to find a perfect spot in which to relieve herself. Her bladder, however, did not care about such niceties, it simply understood it was allowed to empty itself anywhere and could not understand the delay. Because of the heat, she had kept herself hydrated since early morning, but had not visited a toilet since lunchtime.

Fiona's bladder allowed her to walk a bare half a dozen steps steps more, before it took matters into its own hands. She felt an all-too-familiar tingle in her urethra, and only just managed to stop and step her legs apart before a sudden spurt of urine escaped from between her legs.

Deeply embarrassed, yet profoundly relieved at feeling the powerful stream of fluid forcing like a fountain from her bladder, Fiona was somewhat surprised to realise she was also experiencing a deviant thrill at the possibility that David might not been teasing, that he might actually find her display sexually arousing. She knew quite a few couples in the lesbian community who enjoyed their “water games;” why shouldn't it be a straight activity too, she reasoned?

Looking over her shoulder, Fiona saw that John was, indeed, watching her. Since fondling him in the car, his penis had softened considerably; but now, she noticed, it was standing up as stiffly as ever. Feeling oddly proud that she had contributed to this, Fiona smiled warmly back at him, then slowly turned around, so he might better view her stream.

“Did you enjoy that?” David asked her a few minutes later, as she rejoined him. “Maybe not as much as I did, but...”

Fiona thought for a second, then put voice to a notion she had been considering since the university car park. “Honestly?” she said, “More than I'd expected to. I'll probably regret it later, but I've decided to put my lifestyle on hold for the moment and just open myself to... well, anything, really.”

Realising this was an important admission for Fiona to have made, David said nothing, but his eyes brimmed with warmth and understanding. She walked purposefully towards him, and slid her fingers over his erection.

“I saw this getting hard while you watched me pee,” she said. “I should have been angry or embarrassed, but knowing you were being aroused by it, well, that affected me too.”

As she was talking, Fiona was casually stroking David's penis, drawing it ever closer to her pubis; bringing their bodies nearer and nearer, until...

In one glorious instant, their bodies connected: her breasts to his chest, her mouth to his lips, and the rubbery tip of his cock nosing delicately into the heavenly cleft at the apex of her thighs.

Fiona moaned a breathy sigh into David's mouth at the triple contact. This was the first time for her to kiss a man like this, let alone feel his cock touching her intimate parts. It was different to kissing another girl, she thought, but not unpleasant. Not unpleasant at all.

Surrendering herself to the act, Fiona melted her mouth onto David's, then slid her tongue through his lips and tasted him properly for the first time.

She felt his hands lovingly caressing her back. Sliding lower, cupping and caressing her buttocks; fingers stroking in tiny, tantalising circles around the base of her spine. Then delving with sublime intimacy through her bottom cleft, delicately teasing across her anus.

Catching her unawares, David held Fiona tightly and eased his hips forward, pulling her belly and thighs into his. She gasped in surprise when his hard cock scythed through her labia like an enchanted, oversized finger.

Yet as wonderful as it felt, she couldn't help being embarrassed.

“I wish you'd let me clean up first,” Fiona said meekly. “I'm so hot and sweaty... I'm still wet down there after peeing.”

David dismissed her concerns. “Pardon my French,” he said. “But fucking a perfume counter doesn't interest me in the slightest. You smell and taste of real woman, and that does.”

As he said this, Fiona could feel David's erection moving between her legs, stirring up feelings within her that were at the same time alien yet comfortingly familiar. Gainsaying all her sapphic instincts, she felt her genitals respond, lubricating her, as though it was Jenny's fingers intimately touching between her legs, rather than the swollen-hard penis of a man. An older and intriguingly desirous one. One that she could no longer deny herself from wanting to feel inside her.

In an ideal world, Fiona would have preferred to have been bathed and perfumed for such a momentous occasion. But the day had already been bejewelled with extraordinary events far beyond the bounds of her previously idealised world, so why should this be any different, she rationalised, before taking a deep breath and leaping into the void.

“I want you inside me,” she gasped somewhat nervously. “But please be gentle.”

Sensitive to Fiona's needs and fears, David wasted no time in protracted foreplay. He engulfed her mouth in a passionate kiss and, while she was distracted by this, slid his hand down between their loins. Grasping his penis by its root, he angled it upwards, until he felt its bulbous tip lodge satisfyingly into the entrance to Fiona's virgin cunt.

She gave a breathy sigh into David's mouth, then sent the tip of her tongue sliding seductively in and out through his lips.

The inference was subtle but unmistakeable. Recalling Fiona's difficulties with her dildo, he reached through the cleft in her buttocks and began washing her lubricious leakage around and across her anus, hoping to seduce the tight aperture into opening. This time, she recognised his intentions and consciously willed herself to relax.

David dipped, then lifted his hips, easing his cock slowly but inexorably into the mouth of Fiona's vagina. Over the years, both she and her lesbian lovers had studiously managed to work the tiny aperture in her hymen open enough to allow fingers and slim dildos to slide through without causing her any discomfort. Indeed, this is how Jenny's long but petite fingers had managed to bring her to orgasm earlier by reaching and massaging her G-spot.

David's turgid and very masculine organ, however, was a different matter entirely. They both felt when it pushed against her virgin barrier. Fiona moaned in discomfort, and sought to will her vagina not to go into spasm.

David, meanwhile, was more practical. In one distracting, co-ordinated movement, he simultaneously sucked Fiona's tongue into his mouth, captured her breast in a sumptuous, twisting grip, and exquisitely speared two fingers straight through her well-oiled anus.

Bewildered by this triple assault, Fiona's startled cry had barely left her lungs when David's pelvis punched forward, sending his cock stabbing through her hymen and filling her cunt as she never felt before. Fiona had experienced having dildos and fingers inside her, yes, but nothing like this.

It took a moment for her to adjust to the realisation that a man's living penis was lodged inside her body. All her lesbian instincts screamed out that she should be racked with guilt and revulsion, but instead she simply adored the sensation of having a man's cock in her for the first time.

Specifically, she realised, the cock of this particular man: a man who was old enough to be her father, if not her grandfather. She felt safe in his presence, like a comfortable old teddy bear. Albeit one who was currently bringing tears of euphoria to her eyes and sending her libido soaring to the heavens.

Fiona grunted with passion and buried her face in David's chest.

“This feels so good,” she panted, churning her hips enthusiastically. Feeling his rigid cock stirring in her cunt, his fingers reaming around her sphincter muscles. “So dirty, yet so very, very nice.”

“Mmmm...” purred David. “But it can feel even better. Here, grab on to me.”

Fiona barely had time to clutch her hands around his neck before David seized hold between her bum cheeks, hooked his fingers deep into her anus and lifted the startled girl bodily off the ground. She shrieked in surprise, instinctively bringing her legs up to wrap around his waist.

Much to Fiona's delight, this naturally opened her pelvis, and she could feel David's shaft plunging fully home into her vagina. She gasped, clinging to his body like a scared koala bear.

David laughed. “Hey, not so tight,” he said, chuckling. “Loosen up. Use my neck like a fulcrum, swing yourself up and down on me.”

Eager to learn, Fiona did as he suggested, using her mathematical mind to view their body shapes as simple geometric models.

“This is fun,” she said. “Like a fairground ride... my triangle, interacting with your cylinder... it all makes perfect sense.”

Fiona dismissed David's bemused expression. “Well it does to me, anyway,” she laughed, and started toying with her new-found ability to take David's penis fully inside her: using her hold around his neck to help swing herself down on him, feeling his hard cock filling her completely as her pubic bone crashed into his. Bouncing back, until she almost slid off its tip. Almost, but not quite, judging it to perfection before slamming herself back down into his groin.

David watched on lovingly as Fiona used him as a living sex toy. Brimming with carnal euphoria, he had not so much as kissed a woman since before his wife had died. But now, a freshly deflowered and beautiful young woman was fucking him, her cunt as tight and slick as any he could remember.

“This feels... so nice,” he said as they melted easily into one another's rhythm.

“Mmmmm....” said Fiona. Her breathing was growing noticeably laboured as she worked herself on David's shaft. “If only... my lesbian friends... could see me... now. Are you... sure... I'm not too... heavy... for you?”

Despite his age David had kept himself fit, and Fiona's athletic body was an easy enough burden for him to support. But, before he could reassure her of this, her breaths and movements suddenly turned urgent, more vital, and Fiona began punching her groin down into his.

David grunted with pleasure, caught off-guard by his partner's sudden leap forward in pace. But he instinctively responded, jolting his hips forward, punching his cock time and again deep into Fiona's cunt, smashing his pubis into hers. She had never before experienced being filled so completely and with such benign, startling ferocity. Tears of lustful surprise sprang into her eyes.

“This feels.. wonderful! she managed to gasp between breaths. David, too, was caught in the same erotic maelstrom. Ever since seeing Fiona masturbating in the staff room earlier, it had been building steadily. His cock had been at least partially erect for hours, and his balls were achingly full and desperately needed emptying.

“Sorry... need to... cum... soon,” he said, as he thrust himself into Fiona with every-increasing urgency. Her clitoris sparked lustily as their pubic bones collided, David's cock driving deep inside her near-virgin-tight cunt. And on each out-fuck, his finger skewered her rectum with sumptuous vulgarity.

Moments later, Fiona clawed David's back and sank her teeth into his shoulder as she came with a desperate, soul-wrenching squeal. Almost at the same time, David let out an animalistic bellow as his cock swelled and finally erupted, sending copious squirts of creamy sperm high into Fiona's womb.

A short while later, in the heady, panting afterglow of their fucking as they stood cuddling on the grass, Fiona felt David's erection wilt and unplug from her vagina, releasing a rush of warm semen to leak down the insides of her thighs. Her eyes widened with ominous realisation, but David was swift to comfort her.

“No need to worry,” he said soothingly. “I had a vasectomy years ago. Now... pool or hot tub? It's still your choice.”

Fiona giggled mischievously. Then she jumped up onto David's broad chest and cinched her long legs once more around his hips.

“Surprise me, lover boy!” she laughed before sealing her mouth onto his.